can you guys please analysis the following sentence?Do you want to come back for an after party of two?"after " is adj?

can you guys please analysis the following sentence?Do you want to come back for an after party of two?"after " is adj?
can you guys please analysis the following sentence?
Do you want to come back for an after party of two?
"after " is adj?

can you guys please analysis the following sentence?Do you want to come back for an after party of two?"after " is adj?
Yes,it surely is.
Here are some other examples:
in after years,
an after cabin.